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Investment in Kemrock Industries and Exports Ltd - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |  | 3 Months Ended | 12 Months Ended |  | 12 Months Ended
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Nov. 30, 2012 USD ($) | Nov. 30, 2012 USD ($) | Feb. 28, 2013 USD ($) | May 31, 2013 INR | Nov. 30, 2012 INR | Aug. 08, 2012 | May 31, 2012 INR | Aug. 31, 2012 Kemrock Industries and Exports Limited USD ($) | May 31, 2013 Kemrock Industries and Exports Limited USD ($) | May 31, 2012 Kemrock Industries and Exports Limited USD ($) | May 31, 2011 Kemrock Industries and Exports Limited USD ($) | May 31, 2012 Kemrock global depository receipts USD ($) | May 31, 2012 Conversion option, Kemrock 5.5% bonds USD ($) | May 31, 2013 Conversion option, Kemrock 5.5% bonds Kemrock Industries and Exports Limited USD ($) | May 31, 2013 Embedded Conversion Feature Kemrock Industries and Exports Limited USD ($)
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of equity method investment, shares |  |  |  |  |  |  |  |  |  |  | 3,200,000 | 693,072 |  |  |
Equity method investment, carrying value |  |  |  |  |  |  |  |  |  |  | $ 24,200,000 | $ 42,200,000 |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  | 18.00% |  |  |  |
Advances to affiliate |  |  |  |  |  |  |  | 10,000,000 |  | 15,000,000 |  |  |  |  |
Agreement expiration period |  |  |  |  |  |  |  |  |  | Sep. 15, 2012 |  |  |  |  |
Purchase of global depository receipt, value |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  |  |
Investment in affiliate |  |  |  |  |  |  |  |  |  |  |  |  | 22,700,000 |  |
Investment in affiliate, interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% |  |
Kemrock common stock market value per share |  |  |  | 43.85 | 56.70 |  | 531.00 |  |  |  |  |  |  |  |
Kemrock common stock price declining percentage |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |
Impairment loss on equity method investment | 10,100,000 | 42,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Loans deemed uncollectible, recorded as loss |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Loss on Kemrock conversion option | 800,000 | 9,000,000 | 9,030,000 |  |  |  |  |  |  |  |  |  |  |  |
Impairment on investment in Kemrock |  |  | $ 51,092,000 |  |  |  |  |  | $ 42,200,000 |  |  |  |  | $ 13,700,000 | $ 9,000,000

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